Patent GB-1066808-A (GB)
Title: Improvements in or relating to pumps
IPC: F04C14/00
Filed: 1964-05-12
Abstract: 1,066,808. Rotary pumps; reciprocating pumps. T.R.W. Inc. May 12, 1964 [May 16, 1963; Dec.26, 1963], No. 19754/64. Headings F1A and F1F. A rotary pump of the outwardly-sliding vane type comprises a rotor (31), Figs. 2 and 4 (not shown), lodged in pumping chamber defined by a substantially elliptic bore (30) in a member 16 which is situated between a wear plate 14 and a pressure plate 17, the rotor being supported by one end of a bearing bush or liner 121 for a driving shaft 123 mounted in a flanged housing- member 23 to which a casing or shell 20 for the member 16 and plates 14, 17 is attached by screws 119. A valve-member 89 for controlling the output of the pump is slidably lodged in an axiallyorientated bore or passage 87 in the member 16, a compression-spring 84 pressing the valvemember against the plate 17 being situated in passages 82, 86 formed in the plate 14 and the member 23. One end of the valve-member engages with an opening 88 in the plate 17 whereby liquid in a discharge chamber D can displace the valvemember against the action of the spring 84 and enter passages 100, (101) in the member 16 when the pressure of said liquid reaches a predetermined value, the outlet ends of said passages being adjacent to and in communication with an opening 102 in the shell 20, which opening gives liquid in a reservoir 11 access to an inlet chamber I surrounding the member 16. The end of the valve-member abutting the spring 84 is subject to pressure communicated to the passages 82, 86 from outlet passages (73, 74, 76, 77), Fig. 7 (not shown), through a notch 81 in the plate 14. The outlet passages are formed in the member 16, the plate 14 and the member 23 and connect an opening (72) in the plate 17 adjacent the chamber D with an outlet pipe-connector (80) in the member 23, a flow-restricting orifice (71) being placed, in the opening (72) to produce pressure-reduction so that the valve-member 89 operates in accordance with the rate of flow of liquid in the outlet passages. The valve-member contains a non- return valve 94 to relieve excess pressure in the outlet passages. The inlet chamber I is separated from the discharge chamber D by a sealing ring 28, attached to the plate 17. Liquid in the chamber I enters a pair of working spaces (32), 33 through recesses (60, 61) in the plate 14 and further recesses (171), Fig. 1 (not shown), in the plate 17. Two sets of discharge ports 63, (64) in the plate 14 are connected by axial openings 49, (50) in the member 16 to similar ports 66, (67) in the plate 17, the latter ports being in communication with the chamber D. The rotor carries a plurality of vanes or slippers 40 in notches (34), each of which is provided with a recess (48) in one of its side walls to relieve pressure in liquid trapped between the rotor and the inner surface of the member 16 in regions adjacent two lines of contact between the rotor and said surface. Each slipper has a passage 47 formed in one end thereof to effect pressure equalization for liquid lodged within the notches and that lodged between the vanes. Pumping is partly effected by radial reciprocation of the vanes within the notches when the rotor rotates. The plates 14, 17 and the member 16 are aligned with each other by dowels (53, 54) and pressed together by the pressure of liquid in the chamber D, initial loading being provided by a leaf-spring (106) abutting the shell 20. The reservoir 11 is attached to the shell 20 and provided with a filling spout 12.